This type of castle soon replaced the Motte and Bailey castles as it offered a better form of defence. A stone keep was the central feature, with thick walls and few windows. Entrance to the keep was by stone steps leading to the first floor. The kitchens were situated on the ground floor while living quarters were on the upper floors. The first keeps were rectangular in shape but later ones were often circular. The Stone Keep would be surrounded by a thick stone wall containing turrets for lookouts.

The Bailey was now the area outside the keep but within the outer walls and shelter for animals or craft workshops might be built against the walls. The entire castle might be surrounded by a ditch or moat and entrance to the castle was by drawbridge.

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